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6 June, 01:44
What multiples to - 60 and adds to - 28
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Raquel Hicks
6 June, 05:32
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So xy=-60 and x+y=-28
x+y=-28 also means x=-28-y
subsitute x=-28-y for x in xy=-60
(-28-y) y=-60
-28y-y^2=-60
add negative y^2 to both sides
-28y=-60+y^2
add 28y to both sides
0=y^2+28y-60
factor
0 = (x-2) (x+30)
we set them to zero
x-2=0
x=2
x+30=0
x=-30
the numbers could be - 30 and 2
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